Modular Cable Bus System Ventilation Design
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Solution Overview
Problem
Conventional cable bus systems are cumbersome and time-consuming to install, prone to cable damage, and inefficient in heat dissipation, leading to overheating and reduced amperage capacity, especially in underground installations where airflow is limited.
Innovation Solution
A modular cable bus system with ventilated enclosures and offset cross-brace members allows for easy cable alignment and securement, maximizing airflow and minimizing impedance, enabling higher amperage transmission while allowing for flexible expansion and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cable bus systems with split blocks and bolts are used to secure cables, then mechanical protection and cable positioning are provided, but installation becomes cumbersome and time-consuming
Solution Approach 1:
The cable bus system is divided into modular sections with individual cable trays that can be independently installed and configured. Each tray is a self-contained unit with integrated support features, allowing for rapid assembly and disassembly without requiring complex fastening operations across the entire system.
Solution Approach 2:
Cable trays are pre-assembled with integrated support blocks and positioning features during manufacturing. Cables are pre-positioned within the trays before installation, eliminating the need for on-site cable routing and securing operations. The trays arrive ready-to-install with all mechanical components pre-configured.
2Reliability
If cables are drawn over chocks at three-foot intervals to prevent damage, then cable protection is improved, but installation time increases due to labor-intensive cable rollers
Solution Approach 1:
Cable protection elements such as chocks and support blocks are pre-installed on the cable trays during manufacturing. Cables are pre-positioned within the trays with proper support at all intervals before the tray is installed in the final location. This eliminates the need for on-site cable rolling and support installation.
Solution Approach 2:
The cable support blocks are integrated directly into the cable tray structure as a unified component rather than separate elements. The tray and support blocks form a single assembled unit that provides both cable routing and protection functions simultaneously, reducing the number of installation steps.
3Reliability
If conventional enclosed cable bus systems are used, then mechanical protection is provided, but heat dissipation is inefficient leading to overheating and reduced amperage capacity
Solution Approach 1:
The cable tray enclosure features selective ventilation with solid side panels for mechanical protection and open top and bottom edges for heat dissipation. This creates different local characteristics within the same structure: enclosed sides for protection, open top/bottom for thermal management. The design allows hot air to rise and escape through the open top while cool air enters through the bottom.
Solution Approach 2:
The cable bus system combines metallic enclosed sections for mechanical protection with open ventilated sections for heat dissipation. The hybrid structure integrates both enclosed and open features to simultaneously provide protection and thermal management, optimizing both mechanical and thermal performance.
4Reliability
If multiple single conductor cables are spaced apart to prevent mutual heating, then current sharing is improved, but the system becomes less economical and more complex
Solution Approach 1:
The cable bus system divides polyphase power transmission into separate single-conductor cables within individual trays, with each cable carrying a portion of the total current. The modular tray structure naturally spaces multiple cables apart while maintaining organized phase groupings, simplifying the implementation of current-sharing configurations.
Solution Approach 2:
The cable tray system provides universal support for multiple cable configurations and phase arrangements within a single standardized structure. The same tray design can accommodate various numbers of cables, different phase groupings, and multiple amperage requirements, eliminating the need for specialized structures for each configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures efficient heat dissipation, reduces cable damage, and allows for increased amperage capacity, including underground installations, by providing enhanced airflow and simplified maintenance, thus improving the reliability and efficiency of high-amperage cable transmissions.
Implementation Method 1
A further object of this invention is to prove an underground cable bus system meets free or forced flowing air requirements necessary to maintain cooling of the power cables and thereby attain the maximum cable amperage throughout the circuit route.
Implementation Method 2
constructed to provide for enhanced uninterrupted airflow longitudinally along the enclosure
Data Source
AI summary
A cable bus system for the mounting and positioning of high amperature, from low to high voltage electrical power cables transmitting polyphase electrical current. The cable bus system included a ventilated enclosure used to protect electrical cables mounted therein. The enclosure is provided with multiple modular cable trays which are bolted together in a stacked arrangement to form a single multi-level cable raceway. The enclosure is further provide with ventilated top and bottom covers which are secured respectively to the top and bottom of the uppermost and bottommost calve trays to define the enclosed metal circuit. The cable bus system is capable of transmitting the same highest allowable “free air” cable amperature in both above and underground installations, effectively improving the transmission of electrical power from one end to the other end in installations where a transition of electrical power from on the ground is either necessary or economically preferable. For the underground portion, the cable bus is installed in the encasement that is uniquely offset vented or power cooled to meet the cable high amperage requirements. This cable bus system is also suitable for high vertical rise installations when utilizing anti cable slip mechanism or technique.